In the summer of 1941, Hitler invaded the Soviet Union. As the Germans drove towards Moscow, a catastrophic Soviet defeat seemed imminent - a defeat that would have made the Allied liberation of Europe virtually impossible. To keep the Allied victory in sight, Roosevelt and Churchill assembled a crack team of diplomats to secretly travel to wartime Moscow and negotiate with the intractable Stalin.

Dan is joined by Giles Milton, bestselling historian and author of 'The Stalin Affair: The Impossible Alliance That Won the War'. Giles tells us how the leaders who had wanted to destroy Stalin's Russia ended up desperately trying to keep it afloat.

Produced by James Hickmann and edited by Dougal Patmore.

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